New planets (invisible to the naked eye)were initially suspected to exist because their gravitational pull disrupted the orbits of previously known planets.

Question

New planets (invisible to the naked eye)were initially suspected to exist because their gravitational pull disrupted the orbits of previously known planets.

Quizplus · Accepted Answer

This is true. The discovery of Neptune was made in 1846 because its gravitational pull was observed to be affecting the orbit of Uranus. Similarly, the discovery of Pluto in 1930 was made due to irregularities in the orbit of Neptune. More recently, the presence of other planets outside our solar system have been detected through observations of their gravitational influence on their neighboring stars.

New Planets (Invisible to the Naked Eye)were Initially Suspected to Exist